Extractor head for ingot strippers



vFeb.` 28, 1939. M. A. JoLlET v 2,148,625

, ExTRAcToR HEAD FOR IrrGoT sTRIPPERs Filed ot. 9, 19:57 2 sheets-sheet 1 rj rfv-M1 fw l.' L All v. INVENTOR if" Murice A. Jolie .21T @Mp I fm.

Feb. 28, 1939. MA A. JOUET EXTRACTOR HEAD FOR INGOT STRIPPERS:

2 sheets-sheet 2 Filed oct. 9, 19:67

. ping big end down, ingots.

Patented Feb. 28, 1939 .UNITED STATES PATENT orrier.

EXTRACTOR HEAD FORr INGOT STRIPPERS Maurice A. Joliet, Alliance, Ohio, assigner to The Alliance Machine Company, Alliance, Ohio, a

corporation of Ohio Application October 9,

7 Claims.

This invention relates generally to devices for .stripping or extracting ingots from molds.A It relates, more particularly to an extractor head whichcan bevconnected to an. ordinary ingot `stripper inorder to convert the stripper into an extractor. o t

In stripping bigend down ingots from molds, it is common practice to engage the link tongs of a stripping crane with the lugs on the mold, and to exert upward pressure on the mold While at the same time exerting downward pressure on the ingot by means ofA a bull head or ram so as to strip vthe mold from the ingot. It is this type of operation `which` isA referred to herein as a stripping operation, namely, one which is applied to strip- It is alsoknown to extract Abigendup ingots from molds by exerting upward pressure on the ingot while at the same time exerting downward pressure on. the mold. Such types of devicesY are referred to herein as extractors and are employed for extracting big end up ingots from molds, The present invention provides, an extractor head which may be easily-andy quickly connected ,25. to or disconnected from the ram ofy an vordinary .stripping crane which would ordinarily be employed for stripping big enddown ingots, in rorder to convert the stripper into an extractor forex- `tracting big end up ingots. The extractor head may be readily applied to existing stripper cranes. By employing a separate extractorhead, the ex- `tractor headmay be repaired or lubricated while the crane is being used as a stripping crane. rIhiscannotl be done where the extractor head forms a permanent part of thestrippingcrane. Furthermore, the use of a separate extractor head hasthe advantage that when the craneis being employedfor stripping,y no unnecessary weight is carried bythe crane.

VI n the accompanying drawings which illustrate the present preferred embodiment of my invention.

Figure 1 is a vertical section. through anextractor headf portions of a stripping crane and ingot mold being shown in chain lines;

Figure 2 is a vertical sectionthrough the extractor head taken in a plane at'right angles to Figure l; n K

` Figure 3 is a :front elevation of the extractor head;v f

Figure 4 isa horizontalsection taken on the line IV--IV of Figure 3;

'Figure 5` is a detail vertical transverse ysection through` a slide block used for operating the ingot tongs: l

Figure 671s afdetailiside elevation of the slide blockshown in Figure 5; and

Figure 7 is a section throughthe portion of the cross.; head which cooperates with the slide block shownin Figures 5 and 6.

1937, serial No. 168,240

Referring more particularly to the accompanying drawings, the extractor head, indicated generally by the reference numeral 2, may befemployed with any suitable type of stripping crane, such for example as the screw type, the rope type, or the column type. It is here shown as applied to a column type crane having a column or ram 3 and a bull head Il. The crane is also provided with link tongs 55 pivoted as indicated by the reference numeral to a head 'l which may be raised and lowered so as to raise and lower the tongs and to open and close them. The means for operating the tongs is not shown herein because it is well known and forms no part of the present invention.

Generally speaking, the present invention provides an extractor head having a portion engageable by the link tongs so that as the latter are raised, they cause the ingot tongs to grip and extract a big end up ingot from the mold. Thus, the upward motion of link tongs which ordinarily is employed for raising a mold from a big end down ingot is converted into an operation which raises a big end up ingot from a mold.

The extractor head 2 has a top portion or bracket al provided with a central opening 9 which receives the bull head li. The extractor head is secured to the bull head by a key lll passing througha slot ll in the bracket 8 and through a corresponding slot I2 in the bull head. The extractor head is generally rectangular in cross section, as shown in Figure 4, and has four legs l5 secured to and depending from the top bracket 48. The feet i5 of the legs are connected by bolts Il to a bracket I8 which has depending legs I9 and feet 2li. The feet 20 rest on the'top of aningot mold 2l, as shown in Figure 1, and since the feet are connected by the rigid frame of the extractor head to the ram 3, the feety exert downward pressure on the mold during the extracting operation.

' A cross head 24 is supported by the extractor head 2, but is mounted in such manner as to be movable relative thereto. For this purpose guide rods are secured adjacent their top to the bracket 8 ofthe extractor head and adjacent their bottom to lugs 2li formed in the lower bracket I8. There are two guide rods 25, one at the front and one at the rear of the extractor head. The cross head 24 (see Figure 2) is provided with sleeve portions Zl which lit over the guide rods 25. The lower cylindrical extension 28 of the cross head has a sliding t in a yoke 29. As shown most clearly in Figure 4, the yoke 29 has a central cylindrical portion 39 which ts around the extension 28 of the cross head. 'Ihe yoke at its ends is formed into eyes 3| which provide horizontal openings 32 for the reception of pivot pins 33. As shown in Figs. l and 3, these pivot pins are supported on the bracket I8 but are raised therefrom when the yoke is raised in extracting an ingot, as later described. Pivotally mounted on each of the pins 33 is an ingot tong 34. Each ingot tong is provided at its lower end `with a bit 35 of hard material, the bit and tong being connected by a key 36 so that the bit may be easily replaced.

The upper end of each ingot tong 34 is provided with a slide block 38 which is pivoted by a pin 39 to the tong. As shown in Figures 5 and 6, the slide block is provided with a T slot 40 which receives a correspondingly shaped projection 4| (see Figure 7) formed on the inclined cam surface 42 of the cross head 24. 'I'he T slot connection maintains the cross head and slide block always engaged with each other.

The cross head 24 is provided with two lips 43 engageable by the link tongs 5. Each of the lips 43 is rigidly connected to the body of the cross head by two arms 44, one extending in the front and the other in the rear of the cam surface 42. Thus, raising of the link tongs raises the lips 43 and also the cam surfaces 42 of the cross head.

In extracting a big end up ingot from a mold, in accordance with the present invention, the extractor head is secured to the ram of the stripping crane by inserting the key Il). The crane is then moved so as to be over the mold 2l and the feet 2D of the extractor head are placed on the top of the mold. The link tongs 5 are then brought into engagement with the lips 43 of the rcross head 24 and the link tongs are then raised.

This raises the cross head 24. ADuring the first part of the upward movement of the cross head, the ingot tongs 34 simply rock about their pivots 33 without being raised. This rocking is caused by the slide blocks 38 sliding on the cam surfaces 42 which moves the upper ends of the tongs outwardly and the lower ends inwardly, so that the bits 35 bite into the sink head 45. During this part of the upward movement of the cross head, the lower extension 28 of the cross head slides in the yoke 29 which remains stationary and is supported on the bracket I8 by the pivot pins 33. After the tongs have gripped the ingot, continued upward movement of the cro-ss head raises the tongs, the pivot pins and the yoke together and the ingot is extracted from the mold.

In order to limit the minimum opening of the tong bits 35 when the cross head is raised without an ingot sink head being in place, the tongs and yoke are provided with cooperating lugs 45 and 41.

It will be noted that the rocking axes 3 of the link tongs 5 and 33 of the ingot tongs 34 extend inthe same general direction. By this arrangement, the operator has. a clear View of the extracting operation. Furthermore, the extractor may be moved along a row of ingots without raising and lowering the crane a considerable height in order toallow the ingot tongs to clear the sink heads, as would be the case if they ingot tongs were mounted on axes extending at right angles to the axes of the link tongs.

Although I have illustrated and described a present preferred embodiment of my invention, it is to be understood that the invention is not limited thereto, but may be otherwise embodied or practiced within the scope of the following claims.

I claim:

l. In an ingot extractor, a ram, link tongs movable relative to the ram, an extractor head carried by the ram and adapted to exert downward pressure on a mold, means supported by the extractor head and movable relative thereto and provided with means for engagement by the link tongs for extracting an ingot from a mold upon movement of the link tongs.

2. In an ingot extractor, a ram, link tongs movable relative to the ram, an extractor head carried by the ram and adapted to exert downward pressure on a mold, means supported by the extractor head and movable relative thereto and provided with means for engagement by the link tongs for extracting an ingot from a mold upon upward movement of the link tongs.

3. In an ingot extractor, a ram, link tongs movable relative to the ram, an extractor head carried by the ram and adapted to exert downward pressure on a mold, a cross head provided with means for engagement by the link tongs, and pvoted ingot tongs operableto engage an ingot upon movement of the cross head, the cross head and ingot tongs being supported by the extractor head but movable relative thereto.

4. In an ingot extractor, a ram, link tongs movable relative to the ram, an extractor head carried by the ram and adapted to exert downward pressure on a mold, a cross head supported by the extractor head and provided with means for engagement by the link tongs, a yoke for receiving within it a portion of the cross head, Y

the cross head and yoke being movable relative to each other, and ingot tongs pivoted to the yoke and operable to engage an ingot/upon movement of the cross head relative to the yoke, the cross head and yoke and ingot tongs being movable relative to the extractor head.

5. In an ingot extractor, a ram, link tongs movable relative to the ram, an extractor head carried by the ram and adapted to exert downward pressure on a mold, a cross head supported by the extractor head but movable relative thereto, the cross head having means for engagement by the link tongs, a yoke movable relative to the cross head, ingot tongs pivoted to the yoke, a slide block pivoted to each ingot tong, and an inclined cam face on the cross head engageable I by the slide block.

6. An extractor head for extracting big end up ingots from molds, comprising a frame having means for connecting it to the ram of a stripping device so that the frame is carried by the ram, the frame having a portion adapted to contact with an ingot mold, a cross head supported by the frame but movable relative thereto and provided with means for engagement by the link tongs of the stripping device, and pivo-ted ingot tongs slidably connected to the cross head and operable to grip and extract an ingot from the mold upon raising the cross head relative to the frame. l

7. An extractor head for extracting big end up ingots from molds, comprising a frame having means for connecting it to the ram of a `stripping device so that the frame is carried by the ram, the frame having a portion adapted to contact with an ingot mold, a cross head supported by the frame but movable relative thereto and provided with means for engagement by the link tongs` of the ingot stripper, a yoke slidable on the cross head, and ingot tongs pivotally mounted on the yoke, the ingot tongs being slidably connected to the cross head and operable to grip and extract an ingot from the mo-ld upon raising the cross head relative to the frame.

MAURICE A. JOLIET. 

